Fume-arrester.



No. 896,111. PATENTED AUG. 18, 1908.

H. HOWARD. PUME ARRESTER.

APPLICATION FILED JULY 19,1907.

HENRY HOWARD, oi Bos'ronMAs'sAcHUsE'r'rs.

FUME-ARRESTER.

fSpecification of Letters Patent.

Patented Aug. 18, 1908.

Application filed m 19,1907. Serial No. 384,632.

To all whom it may concern:

Be it known that I, HENRY HOWARD, a citizen of the United States, residing at Bos ton, in thecounty of Suffolk and Stateof Massachusetts, have; invented certain new and useful Im rovements in Fume-Arresters, of which the ollowing is a specification;

I This apparatus is especially designed to remove sus ended particles of sohd matter from the ot gases escapin from roasting and smelting furnaces, but 18 applicable to the separation of dust from any gas-current of non-atmospheric temperature.

The apparatus, inits preferred form coinprises two parallel chambers each ofwhich contains a considerable number of superposed horizontal shelves, vertical passages at the ends of these shelves serving to receive and deliver the gases by means of a valvecontrolled inlet at the up er end of onepassage and a valve-contro led outlet at the lower end of the'other'passa e. The valves enable the gases to be de ivered at will through either or both chambers.

Referring to the accompanying drawings, whichillustrate a specific apparatusfor removin dust from the sulfurous gases produced in pyrites burners? Figure 1 is a longitudinal vertical section on the line II of Fig. 2; and Fig. 2 is a transverse verticalsection on the line II'II of Fig. 1.

Theapparatus illustrated comprises two parallel rectangular chambers 1, each of which contains a number of superposed horizontal shelves 2. Atone end of each set of shelves is a'vertical gas-supply passage3 and at the other end is a vertical gas-discharge passage 4. At the upper end of the supplypassage 3- isa gas-inlet 5 controlled by valve 6. Above the valved inlets 5 of the two chamber's'l is a horizontalpassago 7 to which the gases are supplied by pipe 8. At the lower end of the vertical passage 4 is an out let 9 which delivers the gases into an uptake 10 having an outlet 11 controliedby a valve 12. A horizontal passage 13 having a delivery pipe 14 extendslover the outlets 11 of both chambers. The outer wall of each chamber, .at its receiving-end, its-provided with a vertical series of removable tiles 1'5. Lateral cleaning-openings 16, with doors are provided at the lower ends of the passages 4, 1o.

In operation, the valves 6, 12 are opened and gases supplied through the pipe 8 pass into the horizontal chamber 7; and thence through the openin s 5 into the vertical supplyassages- 3. T e entering gases then sub ivide and pass between the shelves, Whereon the dust is deposited. The gases leaving the shelves enter the discharge-passages 4 and escape through the openings 9, uptakes 10, openings 11, horizontal passage 13 and ipe 14. The collected dust may be removed fromthe shelves of either chamber without interrupting the-'flow of gases by closing its valves 6,12, removing the tiles 15,

forcing "the dust from the shelves into the passage 4arid removing it at the bottom through the openings 16.

When the entering gases are QVeIllYfillS- tributed between the several shelves, the

efficiency of the ap aratus varies directly as the number of she ves. In order to effectsuch even distribution of gases of non-atmospheric temperature, it is essential thatthe gas-inletand outlet of each chamber be located respectively at the upper and lower ends oftlfe vertical passages, or in the case of hot gases that'the inlet be at the upper end of the vertical supply-passage and the outlet at the lower end of the verticalldis charge-passage. This fact was-determined by practical test of an apparatus provided with a gas-inlet and outlet both located at the top of the vertical passages, the efiiciency of which was found to be actually lower than when the superposed shelves were omitted. lNhen gases of superatmospheric temperature are introduced'mto a chamber externally cooled by theatmosphere, portionsof the ases are )aitially cooled by the walls and su side, whil quently entering and escaping through openings atthe top take the shortest path between these openings and pass between the upper shelves only, .at such high velocity that little of the suspended dust is deposited. When the inlet and outlet are at the top and bottom, however, the distribution ofgases e'the hot gases subsebetween the different shelves: is substan tially perfect.

If the hot gases begimrtoflow 'too ra idly between the uppershelves,

the vertica cgl mn of gas in t e dischargepassage acqluires a relatively higher temperature and ower specific gravity than the gas-column in the supply-passage, the lower portionof which, moving slowly. into the 1 spaces between the bottom shelves, is abnormally cooled by prolonged contact with the outer walls and thereby densifiedfl The relatively light gas-column in thedischargepassage. thereupon exerts a back pressure and retards the escape of gases from'the-t supply-passage forces the gases between the lower shelves. The present arrangement of passages and openings thus effects an auto-- matic compensation andeven distributiono'f' the gases and in practice substantially identical amounts of dust are deposited on the shelves at the top and bottom. The gas. inlet and outlet, one at the upper end and the other'at the lower end of the passages at the opposite ends of the superposed shelves, constltute, in connection with these pas sages, means for passing substantially equal amounts of gases of non-atmospheric temperature through all of the spaces between the shelves.

When the apparatus is em loyed to treat gases which are cooler than tiie atmosphere, the inlet is located at the bottom of the supplyassage and the outlet at the to of the disc arge-passage. The a paratussiiown in the drawing may be used for such cooler gases by introducing the gases through pipe 14 and delivering them throw ipe 8.

By employing'a large numbefofcloselyspaced plates, it is possible to obtain a separation of solid articles practically as completeas that e 'ected by a filter, while the shelves offer little resistance to the flow of gases.

I claim: I 1. A' fumearrester, com rising a chamber containing superposed she ves, passages at a each containing the opposite ends of said shelveaaninlet at "at th oweiT 'ndTofTth otherpassa e. v 2. fume-arrester, comprising 0 ambers s usierposed shelves, passages at the-opposite en s'of said shelves, an in ct attire-upper end of one -passage, and an outt mi means for passing gases selectivelythrough either or both chambers.

3. A me-arrester, comprising chambers each co taining su erposed shelves, passages at the op osite ends of said'shelves, a valve- 'controlled inlet at the upper end of one passage, and a valve-controlled outlet at the lower end ofthe other passage.

4. A fume-arrester, comprising a chamber op. the" er end of one passage and an outlet shelves while the heavier gas-column in the s? ower end of the other passage, and

containing superposed shelves, passages at a the opposite ends of said shelves, an intake communicating with the upper end of'o'ne passage, and an 11 take communicating with the lower end of t e other passage.

5. A fume-arrester, comprising chambers each containing su erposed shelves, passages at the op osite end; of said shelves, a valvecontrolle intake communicating with the up er end of one passa e, and a valve-contro led uptake communicating with the lower end of the other assage. Y

i In testimony w ereof, I aflix my' signature in presence of two witnesses. 1

HENRY HOWARD.

Witne" es:

EDWIN R. Bonn, W. F. OBURG. 

